Answer:
The mass percent of sulfur is 28.12% (option 1)
Explanation:
Step 1: Data given
Atomic mass of Al = 26.98 g/mol
Atomic mass of S = 32.065 g/mol
Atomic mass of O = 16.0 g/mol
Step 2: Calculate the molar mass of Al2(SO4)3
In 1 molecule Al2(SO4)3 we have 2 Aluminium atom, 3 Sulfur atoms and 12 oxygen atoms
Molar mass of Al2(SO4)3 = 2*26.98 + 3*32.065 + 12*16 .0
Molar mass of Al2(SO4)3 = 342.155 g/mol
Step 3: Calculate the mass percent of sulfur
In 1 molecule Al2(SO4)3 we have 2 Aluminium atom, 3 Sulfur atoms and 12 oxygen atoms
Mass % sulfur = (3*atomic mass of S/ molar mass of Al2(SO4)3) * 100 %
Mass % sulfur = (3*32.065 / 342.155) * 100%
Mass % sulfur = 28.12 %
The mass percent of sulfur is 28.12% (option 1)
